@article{SF_1976__12_134184,
     author = {S. Madhaven},
     title = {On right normal right inverse semigroups.},
     journal = {Semigroup forum},
     pages = {333--340},
     publisher = {mathdoc},
     volume = {12},
     year = {1976},
     zbl = {0345.20059},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134184/}
}